Review exam 4 - Structure & Function

Which best describes the structure of connective tissue?

• Tightly packed layer of living cells

• A matrix (scaffold-like) system of living & non-living cells

• Cells with very long "arms" that extend out to reach one another

• long, thin cells that "contract" when signals are received

Which is NOT true about the signals sent by the nervous system?

• They take a few minutes or more to travel and take effect in the body

• They tend to have localized effects on targeted groups of cells

• They are comprised of electrical impulses and chemical signals

• They may participate in regulatory feedback loops within the body

The feedback loops that regulate blood sugar levels in the body via release of insulin or glucagon are:

• positive feedback loops

• negative feedback loops

• One is positive and one is negative

Tags

NGSS.HS-LS1-3

A poikilotherm is an animal that:

• Gains most of its body heat from internal processes

• Gains most of its body heat from the external environment

• Has a body temperature that fluctuates widely

• Maintains a relatively constant body temperature

Which of the following is NOT true about vasodilation?

• It may happen if you go outside on a very hot summer day

• It may happen if you go for a jog or run

• It helps increase blood pressure

• It acts to widen blood vessels

Tags

NGSS.HS-LS1-3

Where does blood go after leaving the left ventricle in a human heart?

• Into the pulmonary artery

• Into the pulmonary vein

• Into the aorta

• Into the left atrium

• Into the right ventricle

Which phase of the cardiac cycle is the longest, and allows blood to flow INTO the heart?

• Atrial systole and ventricular diastole

• Atrial diastole and ventricular systole

• Atrial & ventricular systole

• Atrial and ventricular diastole

Which of the following is NOT true about veins?

• They have, on average, the widest diameter of all blood vessel types

• They have, on average, the thickest walls of all blood vessel types

• They have valves to prevent backflow

• Gas exchange does NOT occur through their walls

In which blood vessel type would you find the highest blood pressure?

• Arteries

• Veins

• Capillaries

• BP is equal in all blood vessels & only depends on heart rate

Which of the following is NOT a way the body can regulate blood flow in the body?

• Through vasoconstriction/vasodilation

• By increasing/decreasing heart rate

• opening/closing of capillary sphincters

• increasing/decreasing volume of blood that exits heart with each "beat"

Tags

NGSS.HS-LS1-3